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A stainless steel ball (? = 8055 kg/m3 , CP = 480 J/Kg? K ) of...

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Mechanical Engineering

A stainless steel ball (? = 8055 kg/m3 ,CP = 480 J/Kg? K ) of diameter D = 15cm is removed fromthe oven at a uniform temperature of 350 Degrees C. The ball isthen subjected to the flow of air at 1 atm pressure and 30 degreesC with a velocity of 6m/s. The surface temperature of the balleventually drops to 250 degrees 250 degrees C. Determine theaverage convection heat transfer coefficient during this coolingprocess and estimate how long this process has taken. The solutionshould be h = 25.12 W/m2 C and time = 1425 seconds according to theprofessor.

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